Finding the Fourth Proportional to 12,889.90, 17,787.99 and 7,300.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,889.90 : 17,787.99 = 7,300.54 : x
2. Step 2: Convert to fraction form
   12,889.90/17,787.99 = 7,300.54/x
3. Step 3: Cross multiply
   12,889.90x = 17,787.99 × 7,300.54
4. Step 4: Simplify right side
   12,889.90x = 129,861,932.51
5. Step 5: Solve for x
   x = 129,861,932.51/12,889.90
6. Step 6: Final answer
   x = 10,074.70